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Roels, Rick; Janssen, Erick . (2020). Sexual and Relationship Satisfaction in Young, Heterosexual Couples: The Role of Sexual Frequency and Sexual Communication. The Journal of Sexual Medicine, (), S1743609520307165–. doi:10.1016/j.jsxm.2020.06.013 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research